2006/08/11 by V. Guzey, Guzey, V.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Nuclear Theory (nucl-th) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph #nucl-th
paper · pdf · doi:10.48550/arxiv.hep-ph/0608129
16 pages, 5 figures
arxiv created 2006/08/11 · openalex publication_date 2006/08/11 · arxiv updated 2009/12/01 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28
We analyse Theta+ production in the gamma+D -> Λ+n+K+ reaction and study the dependence of the gamma+D -> Λ+n+K+ differential cross section on the nK+ invariant mass and on the momentum of the final neutron pn. We examine the important role of the interference between the signal and background contributions to the gamma+D -> Λ+n+K+ amplitude in the extraction of the Theta+ signal from the gamma+D -> Λ+n+K+ cross section. We demonstrate that as a result of the cancellation between the interference and signal contributions, the Theta+ signal almost completely washes out after the integration over pn. This is consistent with the CLAS conclusion that no statistically significant structures in the analysis of the gamma+D -> Λ+n+K+ reaction were observed. Therefore, there is no disagreement between the theory and the experiment and the CLAS result does not refute the existence of the Theta+.